package org.qinsong.lib.pay.ali;


import android.text.TextUtils;

import org.qinsong.lib.pay.SDKConstants;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Random;


/**
 * 订单参数构建
 */
public class OrderInfoUtil {

    /**
     * 构造支付订单参数列表
     * https://docs.open.alipay.com/204/105465/
     */
    public static Map<String, String> buildOrderParamMap(String biz_content, String notify_url) {
        Map<String, String> keyValues = new HashMap<String, String>();

        //构建业务参数
        keyValues.put("biz_content", biz_content);//"{\"timeout_express\":\"30m\",\"product_code\":\"QUICK_MSECURITY_PAY\",\"total_amount\":\"0.01\",\"subject\":\"1\",\"body\":\"我是测试数据\",\"out_trade_no\":\"" + getOutTradeNo() + "\"}");

        keyValues.put("app_id", SDKConstants.ALI_APPID);

        keyValues.put("charset", "utf-8");

        keyValues.put("method", "alipay.trade.app.pay");

        keyValues.put("sign_type", "RSA2");

        keyValues.put("timestamp", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault()).format(new Date()));

        keyValues.put("version", "1.0");

        keyValues.put("notify_url", notify_url);

        return keyValues;
    }


    /**
     * 构造支付订单参数信息
     * urlencode
     *
     * @param map 支付订单参数
     * @return xx=xx&yy=yy
     */
    public static String buildOrderParam(Map<String, String> map) {
        List<String> keys = new ArrayList<String>(map.keySet());

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < keys.size() - 1; i++) {
            String key = keys.get(i);
            String value = map.get(key);
            sb.append(buildKeyValue(key, value, true));
            sb.append("&");
        }

        String tailKey = keys.get(keys.size() - 1);
        String tailValue = map.get(tailKey);
        sb.append(buildKeyValue(tailKey, tailValue, true));

        return sb.toString();
    }

    /**
     * 拼接键值对
     */
    private static String buildKeyValue(String key, String value, boolean isEncode) {
        if (TextUtils.isEmpty(value))
            return "";
        StringBuilder sb = new StringBuilder();
        sb.append(key);
        sb.append("=");
        if (isEncode) {
            try {
                sb.append(URLEncoder.encode(value, "UTF-8"));
            } catch (UnsupportedEncodingException e) {
                sb.append(value);
            }
        } else {
            sb.append(value);
        }
        return sb.toString();
    }

    /**
     * 对支付参数信息进行签名
     *
     * @param map 待签名授权信息
     * @return sign=xxx
     */
    public static String getSign(Map<String, String> map, String rsaKey, boolean rsa2) {
        List<String> keys = new ArrayList<String>(map.keySet());
        // key排序
        Collections.sort(keys);

        StringBuilder authInfo = new StringBuilder();
        for (int i = 0; i < keys.size() - 1; i++) {
            String key = keys.get(i);
            String value = map.get(key);
            authInfo.append(buildKeyValue(key, value, false));
            authInfo.append("&");
        }

        String tailKey = keys.get(keys.size() - 1);
        String tailValue = map.get(tailKey);
        authInfo.append(buildKeyValue(tailKey, tailValue, false));

        String oriSign = SignUtils.sign(authInfo.toString(), rsaKey, rsa2);
        String encodedSign = "";

        try {
            encodedSign = URLEncoder.encode(oriSign, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return "sign=" + encodedSign;
    }

    /**
     * 要求外部订单号必须唯一。
     *
     * @return
     */
    private static String getOutTradeNo() {
        SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmssSSS", Locale.getDefault());
        Date date = new Date();
        String key = format.format(date);

        key = key + randomInt(10000000, 99999999);
        key = key.substring(0, 24);
        return key;
    }


    /*
     * 生成[min, max]之间的随机整数
     * @param min 最小整数
     * @param max 最大整数
     */
    private static int randomInt(int min, int max) {
        return new Random().nextInt(max) % (max - min + 1) + min;
    }


}
